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Investment Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses, Allowance for Credit Losses and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | $ 120,372 | $ 86,920
Gross Unrealized Gains | 1,280 | 14
Gross Unrealized Losses | (6,162) | (8,121)
Allowance for Credit Losses | 0 |
Fair Value | 115,490 | 78,813
Held-to-Maturity, Amortized Cost | 36,735 | 31,822
Gross Unrecognized Gain | 0 | 0
Gross Unrecognized Losses | (2,499) | (1,742)
Held-to-maturity, Fair value | 34,236 | 30,080
Allowance for Credit Losses | (512) |
US Government Agency securities [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 12,711 |
Gross Unrealized Gains | 279 |
Gross Unrealized Losses | (5) |
Allowance for Credit Losses | 0 |
Fair Value | 12,985 |
US Government Treasury securities [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 4,925 |
Gross Unrealized Gains | 17 |
Gross Unrealized Losses | 0 |
Allowance for Credit Losses | 0 |
Fair Value | 4,942 |
Small Business Administration Loan Pools [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost |  | 858
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (15)
Fair Value |  | 843
Obligations of state and political subdivisions [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 49,640 | 44,189
Gross Unrealized Gains | 420 | 14
Gross Unrealized Losses | (3,015) | (4,034)
Allowance for Credit Losses | 0 |
Fair Value | 47,045 | 40,169
Mortgage-backed securities in government-sponsored entities [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 50,795 | 41,873
Gross Unrealized Gains | 515 | 0
Gross Unrealized Losses | (3,129) | (4,072)
Allowance for Credit Losses | 0 |
Fair Value | 48,181 | 37,801
Other securities [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Amortized Cost | 2,301 |
Gross Unrealized Gains | 49 |
Gross Unrealized Losses | (13) |
Allowance for Credit Losses | 0 |
Fair Value | 2,337 |
Corporate Debentures [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Held-to-Maturity, Amortized Cost | 15,000 | 14,993
Gross Unrecognized Gain | 0 | 0
Gross Unrecognized Losses | (1,592) | (994)
Held-to-maturity, Fair value | 13,408 | 13,999
Allowance for Credit Losses | (512) |
Structured Mortgage-backed Securities [Member] |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |
Held-to-Maturity, Amortized Cost | 21,735 | 16,829
Gross Unrecognized Gain | 0 | 0
Gross Unrecognized Losses | (907) | (748)
Held-to-maturity, Fair value | 20,828 | $ 16,081
Allowance for Credit Losses | $ 0 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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